We die so we could either go to heaven or hell depending on how well you are connected 
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We die because our cells die. During the span of our life, billions of cells die everyday and billions of cell are created everyday. The old cell undergoes division and yields new cells. There is a thing called telomere which acts as a buffer between genes. As the cells divide over the period of our lifetime, telomeres get shorter and shorter till they no longer can protect our genes. That is when we start to get hit by things like cancer, alzheimer's disease, bone decay and you get the picture.
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I have to hit the bed now but I will post in more detail tomorrow if I have time.

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We die because our cells die. During the span of our life, billions of cells die everyday and billions of cell are created everyday. The old cell undergoes division and yields new cells. There is a thing called telomere which acts as a buffer between genes. As the cells divide over the period of our lifetime, telomeres get shorter and shorter till they no longer can protect our genes. That is when we start to get hit by things like cancer, alzheimer's disease, bone decay and you get the picture.
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I have to hit the bed now but I will post in more detail tomorrow if I have time.